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vfio: Find DMA available capability

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The underlying host may be limiting the number of outstanding DMA
requests for type 1 IOMMU.  Add helper functions to check for the
DMA available capability and retrieve the current number of DMA
mappings allowed.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[aw: vfio_get_info_dma_avail moved inside CONFIG_LINUX]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Matthew Rosato 2020-10-26 11:34:33 -04:00 • committed by Alex Williamson
parent 3ab7a0b40d
commit 7486a62845
2 changed files with 33 additions and 0 deletions
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2
include/hw/vfio/vfio-common.h
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@ -214,6 +214,8 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type);
struct vfio_info_cap_header *
vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id);
bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
unsigned int *avail);
#endif
extern const MemoryListener vfio_prereg_listener;